Sharpening device



May 11 1926. 1,584,342

0. s. WRIGHT I SHARPENING DEVI CE Filed Nov. 2'7 1925 W I TNESSES IN V EN TOR:

OZivenSJ Ww'ghi, BY v w L 0/. 7M W ATTORNEYS.

Patented May 11, 1926.

UNITED STATESPATENT orrlcsg OLIVER S. WEIGHT, 0]? MASONTOWN, PENNSYLVANIA, ASSIGNOR TO NEPTUNE MANU- MASONTOWN, PENNSYLVANIA, A CORPORATION OF FAOTURING- COMPANY, OF DELAWARE.

SHARPENING DEVICE.

Application filed November 27, 1925. Serial No. 71,613.

This invention relates generally to de vices for sharpening cutting implements such as knives, chisels, shears, etc., and more particularly to a type embodying two groups of freely-revolvable discswith circumferential cutting edges arranged in overlapping relation to form an interven ing sharpening crotch through which the article being sharpened is adapted to be drawn.

Amongst the objects of my invention are to enable, in connection with a sharpening device of the type referred to, stagewise sharpening, i. e. from an initialcoarse trim or take off of the metal, and through intermediate graduated stages, to a finalhoning action, as may variously be required de pending entirely on the nature of the article being sharpened, as well as upon the condition of its edge; and to secure the above desiderata in a sharpener more especially intended for table use.

Other objects and advantages will be manifest from the detailed description hereinafter of the typical embodiment of my invention illustrated by the accompanying drawings, whereof Fig. I is a View showing the sharpening device in plan;

Fig. II,a side elevation of the same; and

Fig. III, an edge view of the two cooperating disc groups on a larger scale than shown in the preceding figures. 7

With reference to these illustrations, the two groups of cutting discs are comprehensively designated by the numerals 5, 6 re spectively, and, as shown, the components of each of said groups are mounted for free rotation upon axes 7 fixedly supported in the base member 8. These axes 7 are suitably spaced to predetermine a slight overlap of the cutting edges of the respectively corresponding discs, and with resulting formation between the two groups, of a sharpening crotch 9 through which the blade of the article to be sharpened is drawn. In addition to free rotation on the axes 7 the discs may be also allowed a slight amount of lateral play, their proper spacing being however always maintained by appropriate concentric filler washers 10, interposed between them. It is to be especially noted that the cutt ng discs of each of the groups 5, 6 are graduated in size, that is to say, they diminish successiyely in diameter uniformly and symmetrically relative to the central disc 11, which, in each instance, is the largest. It will also be observed that the discs of each group 5, 6 differ in the character of their cutting edges, the outer ones desig nated 12 having sharp cutting edges, the intermediate discs 13, rounded edges, preferably roughened by longitudinal corruga-, tions as conveniently indicated in Fig. III, while the central disc 11 has but a plain smooth rounded edge. As a consequence of the variation in the diameters of the discs of both groups 5, 6, the intersection of the corresponding discs 11-11, 12-12 and 13-13 occur in different planes vertically so that the sharpening crotch 9 is highest in the middle and lowest at the outer ends. As a result of this gradation, it is possible to employ corresponding pairs of the discs separately and thus to effect stagewise sharpening. For example: if a knife blade, in being drawn through the sharpening crotch 9, is properly inclined to the horizon tal in one direction or the other, the end discs 1212 may be employed to effect a rough cut or trim. With a little less inclination of the blade, either corresponding pair of the intermediate discs 11 may be employed to smooth the rough cut or trim previously made; and by holding the blade perfectly horizontal, the central pair of discs 11 may be selected to eflect a final hon ing action. 7

Referring now more in detail to the base 8, it will be observed that the same has a central hollow raised portion 15 that completely houses the two cutting disc groups 5-6 except for a comparatively-narrow central opening 16 Which affords access to the sharpening crotch 9 between the overlapping edges of said disc groups. The side walls 17-18 of the approach to the opening 16 are sloped as shown in FigIII, preferably at different angles. By this construct-ion, implements with a single bevel edge,such as chisels, plane blades, shear blades, etc. may be guided and supported at the proper angle while drawing them through the sharpening crotch 9 as indicated in dotted lines in Fig. II, the difference in the slope of the walls 17, 18 permitting selective choice in accordance with differences in the bevel angle of implements of the kind mentioned. As shown in Figs. I and II, the

' At each end-of the-central raisedportion 15 which houses the disc-gro1'1ps5-6, the weighted base 8 is provided with lugs 19 that afford rests 20 within which carving knives and the like may be inserted for temporary support after sharpening.

Having thus described, my invention, I

claim:

1. A sharpening device of the character described comprising a multiplicity of freelyrevolvable cutting discs, said discs having varied cuttingedges and being graduated as to diameter soas to be capable of selective employment by changing the angle at which the article being sharpened is drawn relative to them.

2. A sharpening device of the character described comprising a multiplicity of freely-revolv-able cutting discs, said discs differing in the character. of their circumferential cuttingedges, and; being graduated with re gard todiame-ter so as to be capable of selective, employment in. effecting stagewise sharpening by varying the angle at which the article being sharpened is drawn relative tothem.

3. A sharpening device of the character described comprising two groups of'freelyrevolvable discshaving contrasting peripheral'edges and overlapping to form a sharpening crotchbetween them, the co-operative discs in the respective groups diminishing in diameter symmetrically to opposite sides of central discs so that any corresponding pair of discs of said groups may be-selectively employed by varying the angle at which the article being sharpened is drawn through the crotch aforesaid.

4. A sharpening device of the character described comprising two groups of freelyrevolvable discs with their cutting edges overlapping to form, a sharpening crotch between them, the discs in the respective groups differing; in thecharacter of: their cutting edges anddiminishing indiameter symmetrically to opposite sides ofcentral discs so that. any corresponding pair of discs of the two groupsmay. be selectivelyemployed by varying theangleatwhich the article being sharpened is drawn through the crotch aforesaid.

5. A sharpening device of the-character described comprisingtwo groups of freelyrevolvable-discs with their cutting edges overlapping to form .a sharpening crotch'between them, the discs of the respective groups diminishing in diameter symmetrically to opposite sides of central discs so that any corresponding pair of discs of the two groups may be selectively employed by varying the angle at which the article being sharpened-is drawn through the crotch, the outside discs in each group having sharp edges for initial rough trimming," the intermediate discs roughened edges for smooth ing, and the central discs plain edges for final honingaction.

' 6. A sharpening device of the character described comprising two groups. of'freelyrevolvable discs, said. discs having cutting edges of contrasting finish and overlapping to different extents with formation of a sharpening crotch between them, whereby any corresponding pair of saiddiscs may be selectively employed by changing the angle at which the article being sharpened is drawn through the sharpening crotch.

7. In asharpening device of the character described, the combination of two groups of freely-revolvable discs having cutting edges of diverse cross-section and. overlapping to form a sharpening crotch between them; and; I

a weighted supporting base completely housing the two disc groups except for opposed medially located narrow. openings afiording access to the sharpening crotch aforesaid.

8. In a sharpening device of the character d scribed, the combination of two groups of freely-revolvable discs having cutting edges of contrasting cross-section and overlapping to form a sharpening crotchbetween them; and a weighted supporting base completely housing thedisc groups except for medially located narrow openings'affording, access to the sharpening crotch aforesaid the ap proach to each saidopening having sloping side walls toassist guidance and support at the'p roper tilt, of cutting implements having a single beveled edge.

9. In the sharpening device of the character described, the combination of two groups of freely-revolvable discs havingcutting edges of contrasting cross-section and overlapping to .form asharpeningcrotch between them; anda weighted supporting base with a central hollow raised. portion completely housing said. discgroups except for opposed medially located bevel-edged openings affording access to the sharpening crotch aforesaid, saidbase alsohaving, at opposite sides ofrits raised portion, vertical projections affording temporary support for carving knivesandthe like.

Inv testimonywhereof, I, have hereunto signed myname at Masontown Pa. this 31st day of October 1925;

- OLIVER s'. WRIGHT. 

